Different aspects of the city’s history and culture will be celebrated in the rebrand.
The network will now include the Lioness, Mildmay, Weaver, Windrush, Suffragette and Liberty routes.
Transport for London says it will make it easier for people to find their way around.
Sadiq Khan has been talking to us about the reasons why the Highbury & Islington to Clapham Junction line has been named The Windrush Line.
Meanwhile, strikes on the London Overground next week have been called off.
Members of the Rail, Maritime and Transport Union, who work for Arriva Rail London, will now vote on a new pay offer.
Walkouts were scheduled for Monday and Tuesday.